ACTUATOR FOR ELECTRIC PARKING BRAKE

An actuator of an electric parking brake is disclosed. An actuator of an electric parking brake according to one embodiment of the present invention includes a driving unit which outputs a rotational force through a driving shaft, a first gear unit which receives the rotational force from the driving unit, a second gear unit including a rotation shaft which receives the rotational force from the first gear unit to rotate, and a driving shaft control unit which is disposed on the driving shaft, provides a degree of rotational freedom to the driving shaft during braking, and fixes the driving shaft to prevent reverse rotation of the driving shaft due to a reverse rotation torque when the braking is ended.